Depth heterogeneity of soil organic carbon dynamics in a heavily grazed alpine meadow on the northeastern Tibetan Plateau: A radiocarbon-based approach
Yu, SY; He, HL; Cheng, P; Hou, ZF
2017
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
Volume122Issue:7Pages:1775-1788
AbstractA deep understanding of soil organic carbon (SOC) dynamics on the Tibetan Plateau is crucial for predicting the response of the alpine carbon pool to future climate changes. Here we present information about SOC stocks and turnover time in a heavily grazed alpine meadow on the Tibetan Plateau based on radiocarbon (C-14) measurements and inverse modeling. Our results reveal that the alpine meadow soil is composed of three distinct carbon pools. The topsoil represents the active carbon pool, which has a carbon inventory-weighted mean turnover time of 64years. The CO2 efflux due to the mineral soil respiration from this pool is approximately 48.45gCm(-2)yr(-1), accounting for 91% of the total heterotrophic soil respiration. The intermediate carbon pool has an inventory-weighted mean turnover time of 780years, and the rate of mineral soil respiration in this pool is an order of magnitude lower than that in the active carbon pool. The parental materials feature the passive carbon pool, which has millennia-long turnover time and the mineral soil respiration is trivial. Comparing our results with other C-14-based studies suggests that grazing intensity may alter not only the SOC stocks but also the soil respiration rate in the alpine grassland ecosystem. The heavily grazed alpine meadow broadly fits the exponential relationship between turnover time and mean annual air temperature identified by meta-analysis of published data from the Tibetan Plateau, alpine grassland, and forest sites elsewhere.
SubtypeJournal
KeywordAlpine meadow Tibetan Plateau radiocarbon soil organic carbon turnover time grazing
Subject AreaEnvironmental Sciences & Ecology ; Geology
WOS Subject ExtendedEnvironmental Sciences ; Geosciences, Multidisciplinary
WOS KeywordECOSYSTEM CO2 EXCHANGE ; MATTER DYNAMICS ; TEMPERATURE SENSITIVITY ; TERRESTRIAL ECOSYSTEMS ; SEASONAL-VARIATIONS ; DIOXIDE EXCHANGE ; GRASSLAND SOILS ; N2O FLUXES ; LAND-USE ; RESPIRATION
Indexed BySCI
Language英语
WOS IDWOS:000407860500015
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44038
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Yu, SY,He, HL,Cheng, P,et al. Depth heterogeneity of soil organic carbon dynamics in a heavily grazed alpine meadow on the northeastern Tibetan Plateau: A radiocarbon-based approach[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2017,122(7):1775-1788.
APA Yu, SY,He, HL,Cheng, P,&Hou, ZF.(2017).Depth heterogeneity of soil organic carbon dynamics in a heavily grazed alpine meadow on the northeastern Tibetan Plateau: A radiocarbon-based approach.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,122(7),1775-1788.
MLA Yu, SY,et al."Depth heterogeneity of soil organic carbon dynamics in a heavily grazed alpine meadow on the northeastern Tibetan Plateau: A radiocarbon-based approach".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 122.7(2017):1775-1788.
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